[Bug 1533631] Re: dhclient killed when DHCPv6 lease is out-of date

[VF]

This problem has been happening to me recently with up to date Ubuntu
16.04 amd64 desktop.

Workaround is to clean up the broken state by removing all leases:

1. Disconnect from the network in Network Manager
2. Execute: sudo rm /var/lib/NetworkManager/dhclient*.lease
3. Connect to the network in Network Manager

After this dhclient -6 keeps running and IPv6 leases are renewed
correctly.

I had this problem on a second very similar installation. There it has
been verified that dhclient -6 process is killed/crashed right after
acquiring the IPv6 address, so I had a second reproduction.

I saved the contents of /var/lib/NetworkManager and can send it to the
developer fixing it on request. There must be something there crashing
dhclient in IPv6 mode.

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https://bugs.launchpad.net/bugs/1533631

Title:
  dhclient killed when DHCPv6 lease is out-of date

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